Introduce AuthenticationException.

Author: Therzok

Diff for: LibGit2Sharp/AuthenticationException.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Runtime.Serialization;
+using LibGit2Sharp.Core;
+
+namespace LibGit2Sharp
+{
+    /// <summary>
+    /// The exception that is thrown when an operation which requires an
+    /// authentication fails.
+    /// </summary>
+    [Serializable]
+    public class AuthenticationException : LibGit2SharpException
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="LibGit2Sharp.AuthenticationException"/> class.
+        /// </summary>
+        public AuthenticationException()
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="LibGit2Sharp.AuthenticationException"/> class with a specified error message.
+        /// </summary>
+        /// <param name="message">A message that describes the error.</param>
+        public AuthenticationException(string message)
+            : base(message)
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="LibGit2Sharp.AuthenticationException"/> class with a specified error message and a reference to the inner exception that is the cause of this exception.
+        /// </summary>
+        /// <param name="message">The error message that explains the reason for the exception.</param>
+        /// <param name="innerException">The exception that is the cause of the current exception. If the <paramref name="innerException"/> parameter is not a null reference, the current exception is raised in a catch block that handles the inner exception.</param>
+        public AuthenticationException(string message, Exception innerException)
+            : base(message, innerException)
+        {
+        }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="LibGit2Sharp.AuthenticationException"/> class with a serialized data.
+        /// </summary>
+        /// <param name="info">The <see cref="SerializationInfo"/> that holds the serialized object data about the exception being thrown.</param>
+        /// <param name="context">The <see cref="StreamingContext"/> that contains contextual information about the source or destination.</param>
+        protected AuthenticationException(SerializationInfo info, StreamingContext context)
+            : base(info, context)
+        {
+        }
+
+        internal AuthenticationException(string message, GitErrorCode code, GitErrorCategory category)
+            : base(message, code, category)
+        {
+        }
+    }
+}

Diff for: LibGit2Sharp/Core/Ensure.cs

@@ -101,6 +101,7 @@ private static readonly Dictionary<GitErrorCode, Func<string, GitErrorCode, GitE
                     { GitErrorCode.LockedFile, (m, r, c) => new LockedFileException(m, r, c) },
                     { GitErrorCode.NotFound, (m, r, c) => new NotFoundException(m, r, c) },
                     { GitErrorCode.Peel, (m, r, c) => new PeelException(m, r, c)  },
+                    { GitErrorCode.Auth, (m, r, c) => new AuthenticationException(m, r, c) },
                 };
 
         private static void HandleError(int result)

Diff for: LibGit2Sharp/LibGit2Sharp.csproj

@@ -343,6 +343,7 @@
     <Compile Include="SshUserKeyCredentials.cs" />
     <Compile Include="SshAgentCredentials.cs" />
     <Compile Include="UsernameQueryCredentials.cs" />
+    <Compile Include="AuthenticationException.cs" />
   </ItemGroup>
   <ItemGroup>
     <CodeAnalysisDictionary Include="CustomDictionary.xml" />